I think that we provide a higher level experience than Fly. Regarding AWS global accelerator, I haven't tested the product, but from what I see we also provide a higher-level experience: we take as input a GitHub repo or a container image, so we can abstract away the VM layer, EC2 - we directly run "applications", not virtual machines
Experience is subjective. People seem to be fine with what Fly offers already. If the high-level experience was a requirement, nobody would be using Fly today. And enterprise customers, who need multi-region already have a solution or seek a solution based on their own cloud (AWS, Azure, GCP all have multi-region offerings)
Maybe experience is not the right term; "offering" would probably be better (or "more managed experience"). Although some people are perfectly happy with what Fly offers, it's probably less accessible to some others -and they hence do not use it.
imo Fly targets more techy users than Koyeb. For example, to setup continuous deployments, you are expected to setup a Github Action (https://fly.io/docs/app-guides/continuous-deployment-with-gi...). If you know what you are doing, it's fine. We want to provide a more managed experience by embedding this kind of capabilities in the platform.
So I would say that Fly is more flexible while we are more accessible